Although I'm not that worried about Insight's solar panels that I didn't sleep well because of that, this question got me thinking!
The Mars Helicopter Scout is a planned robotic helicopter that will scout interesting targets and plan the best driving route for future Mars rovers.
A demonstration model has been approved to fly on the Mars 2020 mission, its payload being a high-resolution camera and a communication system to relay data to the rover. The helicopter has solar panels to recharge its batteries which can produce a power of 220 W.
Could not be the cleaning of solar panels also be an important job for such a helicopter scout?
Can it be calculated roughly if that power of 220 W is enough to remove the dust?
It would only have to land on and lift off from the horizontal laying solar panels carefully.
If I was on the decision-making level of ESA/Roscosmos I would place an order right away for this helicopter from NASA/JPL for the assistance of the Exomars solar power-driven Rosalind Franklin rover!